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Joined 1 year ago
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Cake day: June 8th, 2023

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  • Yes, of course. You will have to adapt it to your time zone, as the German time zone is currently hardcoded. If I had known back then that I would be sharing this at some point, I would have tried harder. 😅

    // ==UserScript==
    // @name         Spoof Timezone
    // @namespace    http://tampermonkey.net/
    // @version      0.1
    // @license      GPL-3.0
    // @description  Overwrites the Date object to use the German time zone
    // @author       dvb
    // @match        *://*.foo.com/*
    // @match        *://*.bar.com/*
    // @match        *://*.foobar.com/*
    // @match        https://webbrowsertools.com/timezone/
    // @grant        none
    // @run-at       document-start
    // ==/UserScript==
    
    (function() {
        'use strict';
    
        const originalDate = Date;
    
        function isSummerTime(now) {
            const month = now.getMonth() + 1; // January is 0, so +1
            const day = now.getDate();
            const hour = now.getHours();
    
            if (month > 3 && month < 10) { // Summer time is from April to September
                return true;
            } else if (month === 3 && day >= 29 && hour >= 2) { // Last Sunday in March at 2 o'clock
                return true;
            } else if (month === 10 && day <= 25 && hour < 3) { // Last Sunday in October at 3 o'clock
                return true;
            }
    
            return false;
        }
    
        function getGermanDate(...args) {
            const now = new originalDate(...args);
            const germanTimeZoneOffset = isSummerTime(now) ? -120 : -60; // German time zone is UTC+1 (+2 during summer time)
            if (args.length === 0) {
                return new originalDate(now.getTime() + (now.getTimezoneOffset() - germanTimeZoneOffset) * 60000);
            } else {
                return now;
            }
        }
    
        // Overwrite the newDate function
        const newDate = function(...args) {
            return getGermanDate(...args);
        };
    
        // Copy the prototypes and static methods
        Object.setPrototypeOf(newDate, originalDate);
        Object.setPrototypeOf(newDate.prototype, originalDate.prototype);
        for (const prop of Object.getOwnPropertyNames(originalDate)) {
            if (typeof originalDate[prop] === 'function') {
                newDate[prop] = originalDate[prop].bind(originalDate);
            } else {
                Object.defineProperty(newDate, prop, Object.getOwnPropertyDescriptor(originalDate, prop));
            }
        }
    
        // Overwrite Date objects
        Date = newDate;
        window.Date = newDate;
    })();
    

  • I have a similar requirement and use a self-written script in Tampermonkey, in which I falsify the wrong time (GMT) to the correct time just for websites I have previously defined. Specifically, I overwrite the newDate function on these.

    This means that Librewolf always displays the wrong time (GMT) by default, except for websites I want to have the correct time (which just are a few) without the need to disable RFP.